. >>> plus, the pope's butler admits to stealing from him. why he says it's for the goo of the church. >>> and a news anchor fights back after a tv viewer criticizes her because of her weight. the on-air response that's led to national headlines today. >>> startling claims that a popular style of smoke detector may not save your family in a fire. welcome back, everybody, at 4:30. i'm jim handly. >> i'm pat lawson muse. when you buy a smoke detector, you think it will sound. >> an investigation by nbc's jeff rossen found that the most common type of smoke detector may give you little warning to get your family out in time. >> reporter: a desperate mother waking up to a house full of smoke, trying to save her kids. >> as i'm trying to get upstairs, my first thought is the four people that i have upstairs. trying to make sure they're not scared to death, that they're safe and that they're okay. >> i have four children dead in the house. it's burning! >> reporter: the kids didn't make it. cause of death? smoke inhalation. so why didn't they have